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Light-control of Liquid Crystal Alignment from Vertical to Planar

Hegde, Gurumurthy and Ata Alla, Rasha and Komitov, Lachezar (2013) Light-control of Liquid Crystal Alignment from Vertical to Planar. Applied Physics Letters, 102 (23). pp. 233505-1. ISSN 0003-6951 (print); 1077-3118 (online)

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Abstract

Continuous or discontinuous transition from vertical to planar alignment was found in nematic cells,containing polyimide alignment layer exposed to linear polarized UV light, depending on whether the alignment layer was mechanically rubbed or not prior the illumination. The polyimide material is designed originally to promote vertical alignment when deposited onto the inner cell substrates’ surface. The mechanism behind these observations is complicated. It includes inclination of the alkyl side chains of the polyimide alignment layer towards the rubbing direction and the bond breaking process due to UV illumination which are considered as the key factors for occurrence of such alignment transition.

Item Type: Article
Subjects: Q Science > QC Physics
Faculty/Division: Faculty of Industrial Sciences And Technology
Depositing User: Dr. Gurumurthy Hegde
Date Deposited: 08 May 2014 03:16
Last Modified: 17 May 2018 07:11
URI: http://umpir.ump.edu.my/id/eprint/5467
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